Bart Vansegbroeck ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5be4380... ) *commented* on HHH-16081 ( https://hibernate.atlassian.net/browse/HHH-16081?atlOrigin=eyJpIjoiM2JmMj... ) Re: Hibernate 6 attribute converter assumes values are immutable ( https://hibernate.atlassian.net/browse/HHH-16081?atlOrigin=eyJpIjoiM2JmMj... ) I ran into the same issue. I have tried adding a specific MutabilityPlan (making a deepCopy) using @Mutability as well, but then the CollectionJavaType that is used in the DirtyCheck seems to always flag the field as dirty, even if the content has not changed. Maybe I went about it incorrectly when I make the deepCopy though. ( https://hibernate.atlassian.net/browse/HHH-16081#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16081#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100214- sha1:9509471 )